<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Ldap
 * @subpackage Schema
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Item.php 17829 2009-08-26 15:07:10Z sgehrig $
 */

/**
 * Zend_Ldap_Node_Schema_Item provides a base implementation for managing schema
 * items like objectClass and attribute.
 *
 * @category   Zend
 * @package    Zend_Ldap
 * @subpackage Schema
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
abstract class Zend_Ldap_Node_Schema_Item implements ArrayAccess, Countable
{
	/**
	 * The underlying data
	 *
	 * @var array
	 */
	protected $_data;

	/**
	 * Constructor.
	 *
	 * @param array $data
	 */
	public function __construct(array $data)
	{
		$this->setData($data);
	}

	/**
	 * Sets the data
	 *
	 * @param  array $data
	 * @return Zend_Ldap_Node_Schema_Item Provides a fluid interface
	 */
	public function setData(array $data)
	{
		$this->_data = $data;
		return $this;
	}

	/**
	 * Gets the data
	 *
	 * @return array
	 */
	public function getData()
	{
		return $this->_data;
	}

	/**
	 * Gets a specific attribute from this item
	 *
	 * @param  string $name
	 * @return mixed
	 */
	public function __get($name)
	{
		if (array_key_exists($name, $this->_data)) {
			return $this->_data[$name];
		} else {
			return null;
		}
	}

	/**
	 * Checks whether a specific attribute exists.
	 *
	 * @param  string $name
	 * @return boolean
	 */
	public function __isset($name)
	{
		return (array_key_exists($name, $this->_data));
	}

	/**
	 * Always throws BadMethodCallException
	 * Implements ArrayAccess.
	 *
	 * This method is needed for a full implementation of ArrayAccess
	 *
	 * @param  string $name
	 * @param  mixed $value
	 * @return null
	 * @throws BadMethodCallException
	 */
	public function offsetSet($name, $value)
	{
		throw new BadMethodCallException();
	}

	/**
	 * Gets a specific attribute from this item
	 *
	 * @param  string $name
	 * @return mixed
	 */
	public function offsetGet($name)
	{
		return $this->__get($name);
	}

	/**
	 * Always throws BadMethodCallException
	 * Implements ArrayAccess.
	 *
	 * This method is needed for a full implementation of ArrayAccess
	 *
	 * @param  string $name
	 * @return null
	 * @throws BadMethodCallException
	 */
	public function offsetUnset($name)
	{
		throw new BadMethodCallException();
	}

	/**
	 * Checks whether a specific attribute exists.
	 *
	 * @param  string $name
	 * @return boolean
	 */
	public function offsetExists($name)
	{
		return $this->__isset($name);
	}

	/**
	 * Returns the number of attributes.
	 * Implements Countable
	 *
	 * @return int
	 */
	public function count()
	{
		return count($this->_data);
	}
}